<?php
header('content_type:text/html;charset=utf8');
$username=$_POST['username'];
$password=$_POST['password'];
$email=$_POST['email'];
$tel=$_POST['tel'];
$con=mysqli_connect("localhost",'root','root','2014');
mysqli_query($con,"set names utf8");
$res = mysqli_query($con,"select * from user where username='$username'");
$row = mysqli_fetch_assoc($res);
if($row){ 
    $arr = [
        "meta"=>[
            "status"=>2,
            "msg"=>"用户名被占用"
        ],
        "data"=>null
    ];
}

// $res = mysqli_query($con,"select * from user where username='$username'");
// $row=mysqli_fetch_assoc($res);
// if($row){
//     $arr=[
//         "meta"=>[
//             "status"=>2,
//             "msg"=>"用户名被占用"
//         ],
//        "data"=>null
//     ];
// }
else{
    $res=mysqli_query($con,"insert user(username,password,email,tel) value('$username','$password','$email','$tel')");
    if($res){
        $arr = [
            "meta"=>[
                "status"=>0,
                "msg"=>"注册成功"
            ],
            "data"=>null
        ];
    }else{
        $arr = [
            "meta"=>[
                "status"=>1,
                "msg"=>"注册失败"
            ],
            "data"=>null
        ];
    }
}
echo json_encode($arr);
?>